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2 Sheets-Sheet 1.

(No Model.)

J. G. SMITH. GAS GUVBRNOR. No. 541,127. Patented June 118, 1895.

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J. G. SMITH. GAS GOVERNOR.

2 Sheets-Sheet 2.

(No Model.)

No. 541,127. Patented June-1a, 1895.

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l UNITED STATES PATENT OEEIOE.

JOHN GEORGE SMITH, OE MONTREAL, CANADA.

GAS-GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 541,127, dated June 18,1895. Application filed November 20,1894. Serial No. 529,417. (Nomodel.) Patented in Canada July 9, 1.894, No.46,530.

To @ZZ whom t may concern.-

Beit known that I, JOHN GEORGE SMITH, of the city of Montreal, in thedistrict of Moutreal and Province of Quebec, Canada, have inventedcertain new and useful Improvements in Gas-Governors, (for which I haveobtained Letters Patent of the Dominion of Canada, under No. 46,530,granted July 9, 1894;) and I do hereby declare that the following is afull, clear, and exact description of the same.

This invention relates to gas governors having inverted cup shapedfloats with their edges dipping into sealing fluid and carried by theinlet valve stem, the object being to secure a governor the inlet-valveof which will be balanced or held practically in equilibrium by the gaspressure and consequently be more responsive in its action to slightchanges in the pressure or' quantity of gas used.

The invention consists of a gas governor constructed and arranged toallow of the introduction of the initial body of gas between two iioatsdiffering in area for the purpose of controlling the inlet valve, andfor full comprehension thereof, reference must loe had to the annexeddrawings, forming a part of this specification, in which like symbolsindicate corresponding parts, and wherein- Figure lis a vertical sectionof the governor, and Fig. 2 a horizontal section thereof, each sectionbeing taken respectively on a line a: in the other figure.

I have ascertained byexperiment that for the valve to work properly andupon the slightes t fluctuation of pressure, it is necessary to balanceit in some Way or hold it in equilibrium upon such iieXible cushions asthe gas itself canfurnish and to this end I use a pair of ioats attachedat different heights to the valve stem and introduce a body of gas'between them.

Any suitable form of casing can be used provided two gas chambers arefurnished each of which has a float above it and I prefer to use theform of construction of casing and parts shown in the accompanyingdrawings and which I will now describe in detail.

a is an annular hollow casing or section having inlet opening b andoutlet opening o in opposite sides, separa ted bya partition d having ahorizontal and a vertical portion, and

the horizontal portion containing an inlet aperture d controlled by theusual valvee, the bottom of the cast-ing having a suitably coveredaperture a through which the valve e can be reached when desired, andthe upper portion a2 of the casting having an annular trough a3 forsealing duid and being perforated for the passage through it ot' thevalve stem e'.

f is a second annular casting or ring having a downwardly projectingflange f', screw threaded interiorly to take onto the screw threadedupper edge of the casting a so thatit will be located above this latter,also having a trough fsimilarfto the oneo,3 for containingfa/second bodyof sealing fluid, and further having a bar f3 perforated to act as anupper guide for the valve stem e. Resting on this second casting orsection is any suitable top or cover piece g.

h is a float of the usual inverted cup type secured in the usual way tothe'valve stem e at such a point that its edges will playin the sealingfluid in the lower trough 0,3, and j is a second float of a similar formalso carried at a higher point by the stem e so that its edge will dipin the sealing fluid ot' the upper trough f2 and on which the usualinterchangeable weight 3 is placed.

The space inclosed bythe casting a and the lower float h constitutes onthe inlet side of the partition d a lower main gas chamber and on theOpposite or outlet side of the partition a delivery chamber, while thespace between the top of iioat h and the under side of iioat 7'constitutes an upper or secondary gas chamber Z and the dividing wall ofthe casting a be- J tween the main and secondary chambers is piercednear the main inlet b to aord a passage m through which gas can reachthe chamber Z.

The operation of the governor is as follows: When a large call or drainis made upon the governor the incoming gas rushes as it were, into avoid and expanding itself reduces the pressure on the under side of thelower oat h, thereby oifering less resistance t-o the depressing .Weightvalve e to descend (which being in eclnilib` rium it easily does) and solets in gas according to the requirement. When less gas is This causesfloat and,

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called for, the pressure increases at the governor and acting on theunder side of neat h,

maintaining one equilibrium and the low pressure the other.

The low pressure equilibrium is formed by the weight 3 on top of floatacting proportionately downward, to the upward pressure on the underside of bottom float h.

The high pressure equilibrium is formed bythe incoming gas entering'rthesecondary chamber andvacting between the two floats k and j, thedifference of whose areas' is equal to the area of the valve e. Thisdifferential area through the medium of the initial gas maintains adownward pressure on the top of the float hequal to the upward pressureon the under side of valve e. Thus there are two equilibriumsestablished, each acting independent of the other.

From the foregoing' it will be readily apparent that the body of gas inthe upper chamber entering from a point close tothe main inlet is at ahigher pressure than the body of gas in the delivery chamber on theoutlet side of the partition d owing to the passing of large quantitiesof the latter body through the outlet c but at the same pressure as thebodyof gas in the main chamber beneath the Valve, and consequently Ifind it desirable to establish a difference in vthe comparative areas ofthe twofioats making the upper float less in area preferably bydiminishing the di= ameter thereof, in order to secure a downwardpressure upon the valve through the gas in the secondary chamber bearingupon the upper surface of the lower float, equal to the upward pressureof the gas in the main chamber beneath the valve.

What I claim is as follows: y

1. A gas governor of the class described having a main gas chamber orpassage leading to the delivery outlet, a valve controlling the inlet tosaid main chamber, and a secondary gas chamber, the latter incommunication with the main gas supply so as to contain a body of gasadapted to exert a pressure upon a pair of valve operating tioats, oneacted upon upwardly and the other downwardly, equal to the pressureupward of the main or initial body of gas beneath the valve and upon theunder side of the lower iioat on the lower pressure side, for thepurpose set forth.

2. A gas governor of the class described having a main gas chamber orpassage leading to the delivery outlet and a secondary gas chamber, thelatter to contain a body of gas of the same pressure as that of the mainbody of gas, and the valve operating parts of which, comprising a stemand pair of sealed floats, are acted upon by the gas in said secondarychamber so as to be depressed by same, for the purpose set forth.

3. A gas governor having a main gas chamber or passage and a secondarygas, chamber,

the latter to contain a body of gas of the same pressure as the mainbody of gas, a valve to regulate the flow of gas from said main chan1-ber, an operating stem for said valve with a pair of floats secured tosaid stem and constituting the bottom and top of said secondary gaschamber and suitable sealingtroughs for said float-s.

4. A gasgovernor having a casing with inlet and outlet and communicatingpassage between, a 'valve to regulate the ilow of gas from such mainchamber, a stem carrying such valve, a pair of floats also carried bysaid stem gas of the same pressure as the main body thereof between saidfloats for the purpose set forth. Y

5. A gas governor of the class described having a main gas chamber orpassage and a secondary gas chamber in communication with each other,-the latter to contain a body` of gas of the same pressure as that of themain body of gas and the valve operating parts of which, comprising astem and pair of sealed floats differing in area, are acted upon by thegas in said secondary chamber for the purpose set forth.

6. A gas governor of the class described having a main gas chamber, adelivery chamber and a secondary gas chamberthe latter in communicationwith the main chamber and adapted to contain a body of gas of equalpressure to the gas in the main chamber, a

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valve to regulate the now of gas from such Y main chamber, and operatingparts for said valve comprising a stem and pair of sealed floats, one ofwhich latter forms the top to said delivery chamber and the other ofwhich forms the top of said secondary chamber, the

its upper surface, and a guide integral with such second section for theupper end of the valve stem, a valve for controlling the flow of gasthrough said valve aperture, a valve stem carrying said valve and a pairof floats carried by said stem and having their edges dipping in saidsealing troughs, the upper wall of said main section being perforated atone or more points near the main inlet, for the purpose set forth.

8. In a gas governor, the combination with a suitable casing providing amain chamber, a delivery chamber and a secondary chamber, the main gaschamber having an inlet and the delivery chamber, an outlet, with acommunicating passage between such main chamber and delivery chamber,and a secondary inlet from said main chamber to said secondary gaschamber, of a valve to regulate the flow of gas through saidcommunicating passage, such valve being carried by a suitable stem, oatsalso carried by said stem and constituting the tops respectively of,said secondary and delivery chamber and sealing troughs for suchfloats.

9. A gas governor of the class described having an inclosing casing andavalve axed to a spindle upon'which two Iioats or inverted diaphragms areattached, the oats being of dierent area and one acted upon upwardly andthe other downwardly by gas of the initial pressure in such a mannerthat through the medium of said fioats and the initial pressure of gas,the controlling valve is held in equilibrium.

10. In a gas governor of the class described having a valve affixed to aspindle and a pair of floats differing in area carried by such spindle,an inclosing casing affording chambers and passages for the introductionof the initial body of gas between said iloats for the purpose ofcontrolling the inlet valve.

JOHN GEORGE SMITH.

Witnesses:

FRED. J. SEARS, R. A. C. KIMBLE.

